77809869192 has 64 divisors (see below), whose sum is σ = 213308400960. Its totient is φ = 23456563200.

The previous prime is 77809869143. The next prime is 77809869223. The reversal of 77809869192 is 29196890877.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712609 + ... + 814512.

It is an arithmetic number, because the mean of its divisors is an integer number (3332943765).

Almost surely, 2^77809869192 is an apocalyptic number.

It is an amenable number.

77809869192 is an abundant number, since it is smaller than the sum of its proper divisors (135498531768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77809869192 is a wasteful number, since it uses less digits than its factorization.

77809869192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527334 (or 1527330 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 66.

The spelling of 77809869192 in words is "seventy-seven billion, eight hundred nine million, eight hundred sixty-nine thousand, one hundred ninety-two".